Purifying Water with Nanofibrous MOF Membranes

  • Author: Irene Maluenda
  • Published: 02 March 2018
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: Journal of Materials Chemistry A/Royal Society of Chemistry
  • Associated Societies: Royal Society of Chemistry (RSC), UK
thumbnail image: Purifying Water with Nanofibrous MOF Membranes

Water contaminated with heavy metals is an important environmental concern, especially due to the metals’ cumulative effect in organisms. Metal-organic frameworks (MOFs) are coordination networks of metal ions or clusters linked using organic ligands. The combined effects of the organic and inorganic moieties allow tuning the size of the pores and provide high surface area to mass ratios while ensuring that the material is chemically and structurally stable.

Dipak Rana and colleagues, University of Ottawa, Canada, have developed an efficient membrane containing MOFs that can efficiently remove Pb2+ and Hg2+ ions by filtration of contaminated water solutions. MOF 808, containing Zr6 clusters, and the Fe-based MOF-F300 were enmeshed in nanofibers of polyacrylonitrile (PAN) and polyvinylidene fluoride (PVDF).

The team concluded that the adsorption of the metals was due to a combination of competitive ion exchange, electrostatic interactions, and pore filling of the MOFs. Removal of Hg2+ and Pb2+ was achieved under controlled acid conditions. The experiments demonstrated that the total negative charge of the deprotonated COOH groups at the metal clusters drags the positive metal ions from the surface into the pore cavity. This was shown by a continuous decrease of the pH as the heavy metal ions promoted the release of protons.


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Uttam Das wrote:

Excellent work by Dr. Dipak Rana and co-workers

An excellent discovery of Nanofibrous MOF Membranes for removing heavy metals by Dipak Rana and Prof. Matsuura group. The group showed that a new class of MOF materials selectively adsorb heavy metal ions (Hg2+ and Pb2+) from the contaminated drinking water. It is an outstanding adsorption technique not only useful in clean water technology but also in other areas i.e., in the textile industry, wastewater treatment, manufacturing industry where the removal of these toxic metal ions remains a huge challenge.

Tue Jul 24 18:21:36 UTC 2018

Arun Guha wrote:

Outstanding Article of Dr. Dipak Rana

Dr. Rana and his group have done a great work. Their discovery might be use full in textile effluent treatment., because textile effluent contains different types of heavy metals.

Fri Jun 29 11:51:26 UTC 2018

Sib Sankar Mal wrote:

MOF membranes for removal of heavy metals

Excellent piece of work!!!! Hats off to the Prof. Rana and Prof. Matsuura group for discovering this adsorption technique. They have discovered a new class of materials for removal of heavy metals form the contaminated drinking water. It is indeed a brilliant approach for the water treatment. Currently, the whole world is facing the water crisis challenge and this MOF membrane would be the next generation technology without any doubt.

Thu Jun 07 10:52:06 UTC 2018


Purifying Water with MOF Membranes

Excellent piece of work from Rana and Matsuura research Group from the University of Ottawa.

The beauty of the work is the cumulative effect of competitive ion exchange, electrostatic interactions, and pore-filling of the MOFs for the removal of heavy metals. Utilizing different phenomenon and developing a hybrid system is a brilliant approach for the effective water treatment.

With increasing demand for clean water, no doubt in future clean water is going to be our next oil, and the demand for the easy, energy efficient and economic clean water technologies will only be a solution to fulfil this requirement for the increasing industrialization and world population.

Tue Apr 24 06:19:27 UTC 2018

Tarun Tapan Roy wrote:

Metal-organic frameworks supported on nanofibers to remove heavy metals

Removal of heavy metal ions (like Hg2+ and Pb2+) from contaminated water with the membrane containing Fe(III) and Zr(IV) based metal-organic frameworks that enmeshed in polyacrylonitrile and polyvinylidene fluoride electro-spun nanofibers have successfully developed by Rana e tal. This filtration technique will be more useful than ion exchange, electrostatic interaction and other traditional methods. So, I have strongly recommended this adsorption technique to publish in daily newspapers to aware public.

Fri Apr 20 07:58:01 UTC 2018

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